The Domino Console Message "terminated abnormally" doesn't mean much. It just means that Domino had a Process ID for STbroadcastgateway and no longer sees it running. This can be due to a crash, or because of a bad startup. The message will repeat, because Domino Checks for the process very often, not because the process is starting and stopping.
I would check a "Netstat -NAB" to see what application is listening on port 8081. If the Process is Framework.exe check this TN as a possible reason why this is occurring.